Can't connect to the DB2 database on localhost, using DBeaver 3.1.1

I have a DB2 Express C v.10.5 database running on localhost, but simply I can't connect to it.

Translation of the error message below: "java.net.ConnectException: An error occured when opening the socket to the server ... on port 50000 with message: Connection refused"

Driver properties:

I am using DBeaver 3.1.1, Ubuntu 14.04 LTS 64 bit.

Can somebody please help? :|